Improvement in chair-bases



Unrrnn S'rn'rns a'rnn'r @Ferca WILLIAM T. DOREMUS, OF NEW YORK, N. Y.

IMPROVEMENT IN CHAIR-BASES.

Specification forming part of Letters Patent No. 163,054, dated May 11, 1875; application filed March l, 1875.

To all whom t may concern:

Be it known that I, WI'LLIAM T. DoREMUs, of the city, county, and State of New York, have invented a new and useful Improvement in Chair-Base, of which the following is a specification: l

Figure l is a top view of my improved chair-base. the pivot and top plate being removed. Fig. 2 is a vertical section of the same taken through the line a' x, Fig l. Fig. 3 is a side view of the same, the feet being removed.

Similar letters of reference indicate correspondin g parts.

The object of this invention is to furnish an improved base for pivot and screw chairs, which shall be simple in construction and inexpensive in manufacture, and at the same time strong and durable.

The invention consists in the base-plate cast with the socket to receive the pivot or screw, and the sockets to receive the legs, in the combination of the top plate provided with a tapering central hole, and with pins or points with the tapering projecting upper end of the socket of the base-plate, and in the ring-groove formed in the top plate of the base, in connection with the ring-rib formed upon the pivot-plate, as hereinafter fully described.

A is the base-plate, in the center of which is formed a hole or socket, al, to receive the pivot or screw of the chair, and which is made long enough to give a firm bearing to said pivot or screw. The inner surface ofthe socket a1,of the plate A, is made smooth when a pivot-chair is to be made, and has a screwthread formed in it when a screw-chair is to he made.

Upon three or more sides of the socket al are formed seats a2 for the inner ends of the legs B, which legs project nearly horizontally, and have casters G pivot-ed to the lower side of their outer ends. The bottoms of the seats are made V-shaped, and the legs B are made square and are arranged diagonally, so as to iit into the seats a2.

Upon the plate A and beyond the seats a2 are formed angular or V-shaped arches a3,

which, in connection with the seats a2, form sockets to receive the legs B.

If desired, the sockets a2 a3 may be arranged with a fiat side upward, but I prefer the diagonal arrangement as being more easily cast, and requiring a less amount of metal. In the angles ofthe seats a2 and arches a3, either or both, are cast pins or points a4, which enter holes in the legs B, and thus hold said legs from drawing out. The pins a4 are placed near the outer edges of the seats a2, and near the inner edges of the arches a3. The legs B are further secured in place by screws a5, which pass through holes in the arches a3 near their outer edges, and through the seats a2 near the socket al, and screw into the legs B. The inner screws a5 strengthen the wood that the lower pins a4 bear against, and thus render them less liable to tear out.

The upper end of the socket al projects a little, is rounded oft' and slightly tapered, and upon it is placed the top plate D, the hole through the center of which is also slightly tapered, so that should there be any wear, or should the wood shrink the plate D may settle down a little, and thus keep everything tight.

Upon the lower side of the top-plate D are cast pins or points d1, which enter holes in the legs B, and thus farther strengthen the connection. Upon the upper side of the top plate D is formed a ring-groove, d2, to receive a ring-rib, el, formed upon the under side of the plate E, formed upon or attached to the upper end of the pivot F. The -rib e1 and groove e2 are thus made to regulate and steady the movement ot' the pivot-plate E on the plate D. The plate E is designed to be secured to the chair-seat.

This construction enables the plate A to be cast without using cores, so that it can be cast readily and with perfect accuracy.

Having thus described my invention, I claim as new andvdesire to secure by Letters Patent- 1. The base-plate A, cast with the socket al to receive the pivot or screw, and the sockets a2 a3 to receive the legs, substantially as herein shown and described.

2. The combination ofthe top plate D, prod2 formed therein, in combination with the vided With ai tapering central hole and pins ring-rib e1 formed upon the pivot-plate, subor points d1, with the tapering projecting` upstautially as herein shown and described.

per end of the socket a and sockets a2 a3 0f WILLIAM T. DOREMUS. the base plate A, substantially as herein Witnesses: shown and described. JAMES T. GRAHAM,

3. The top plate D having the ring-groove T. B. MOSHER. 

